Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53fbc7b5dbf2622…

MALICIOUS

PDF

71.5 KB Created: 2020-12-20 22:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d1d5a6ab5889be61ab5840c21e5c3ae2 SHA-1: 53948e63696a535d4747302f848f454f8f4ee77b SHA-256: a53fbc7b5dbf2622b1b8e6a7ee81c7eadd3e71d89b3598fddd54ac22af7f8db2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm and a phishing lure, specifically mentioning a 'Minecraft redeem codes' theme. It embeds external URIs, including one pointing to 'trafffe.ru', which is likely a malicious redirection or phishing site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a payload or visiting a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/123?utm_term=minecraft+redeem+codes+xbox+one PDF link annotation
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/vurane_lijitoxateso_sekebemibunevip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fc6b80ce53db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5fbba72f05b7d.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/9395623.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/raloguxotogukega.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/1660220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f9191d5efd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fa09e7bb6886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piradi/penguin_diner_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/aadukalam_tamil_movie_cinemavilla.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49422dd96f5918e4b45d/1606371651829/bavinovuvirevubu.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/what_does_divinely_guided_mean.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5348 bytes
SHA-256: fbfa42b03e8d2108c74c4a3b083c7b5cccd0ff98e643d29f3d3ca51602d53d1e
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10416 bytes
SHA-256: 35d089328cece34fa9f473d54ac8e9b02f3de2dae649cc86c2dc22b6ef78e732

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